New SIP Trunking Support

Communications Server 2007 R2

Topic Last Modified: 2009-08-24

Office Communications Server 2007 R2 simplifies and reduces the cost of deploying Enterprise Voice by enabling an enterprise to connect its voice network to a service provider offering PSTN origination and termination. This capability, a variety of what is known in the telecommunications industry as SIP trunking, means that enterprises do not need to deploy IP-PSTN gateways in order to enable PSTN connectivity.

An enterprise user inside or outside the corporate firewall can make a local or long-distance call specified by an E.164-compliant number that is terminated on the PSTN as a service of the corresponding service provider.

Any PSTN subscriber can contact an enterprise user inside or outside the corporate firewall by dialing a Direct Inward Dialing (DID) number associated with that enterprise user.